某重型立车静压转台热特性分析与实验研究

Simulating thermal characteristics and experimental studies of hydrostatic rotary table for heavy vertical lathe

以某重型立式车床静压转台为研究对象,通过ANSYS Workbench建立油膜-转台这一流固耦合模型,探讨不同转速条件下,因油膜的摩擦发热导致的转台温度场及热变形场的变化规律。分析结果表明:油膜封油边处温升最大,在转速低于20 r/min时,静压转台热变形随转速的增加而缓慢增大;在转速高于35 r/min,静压转台热变形随转速的增加迅速增大。同时对不同工况下的油膜温升进行了测试实验,与封油边油膜瞬态温度仿真结果能够较好地吻合,转台边缘轴向热变形与径向热变形测试结果与仿真结果的变形方向及趋势是一致的。研究结果为进一步分析重型立车运行过程中的热误差控制及结构设计优化提供了理论依据。

The liquid and solid coupling of oil film and hydrostatic rotary table of one heavy vertical lathe was solved with the Fluent software. The thermal deformation of the rotary table was calculated with the ANSYS Workbench software based on the finite element method. The analysis results show that,maximum temperature rise appears on the sealing oil side,and with the increase of rotational speed,the values of maximum radial thermal deformation of hydrostatic turntable increase slowly as the speed is lower than20 r / min,and increases rapidly as the speed is higher than 35 r / min. Meanwhile,sealing oil side film transient temperature simulation results can match better with the results of oil film temperature measurement under different working conditions,and the numerical results of thermal deformation along the axial and radial direction have the same direction and tendency with the thermal deformation measurement on edge of rotary table. The results provide theoretical foundations for the further analysis of thermal error control and structural design optimization in manufacturing process of heavy vertical lathe.